Back on the original subject, I've had a 2011 Partner from 2013 and have (touch wood) not had any issues. It had about 50K on it when I got it and has about 110K now, so not quite up to the mileage that your looking at. Servicing has never been an issue - always in and out in a day at the local mechanics, and he's never commented on issues with getting parts. Mine is the 1.6 turbo diesel - does about 1000km on a tankful - think it's about 60 litres - so pretty good, especially on long trips.
One tip - make sure you're looking at the longer version - you'll need this to get bikes in comfortably. I can quite happily get 4 bikes in for trips to Thredbo etc, although with todays slacker geometry, it's getting tighter. The short version would probably be a wheels off job for 2 or more bikes.